1. This transaction was made pursuant to a trading plan entered into in accordance with Rule 10b5-1 under the Securities Exchange Act of 1934 and previously disclosed in the Issuer's Form 10-K filed on February 15, 2018 with the Securities and Exchange Commission.

2. Represents the weighted average sales price for price increments ranging from $139.95 to $140.16. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares sold at each separate price for all transactions reported on this Form 4.

/s/Wendy C. Skjerven, by power of attorney

03/09/2018

** Signature of Reporting Person

Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person,
see
Instruction
4
(b)(v).